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A Fuzzball is a model for the composition of black holes that uses string theory. The Fuzzball model helps explain the size of black holes and. Under classical physics black holes collapse to infinite density, but black holes appear to have size and emit a faint amount of light. Fuzzballs can emit beacuse of the ossilations of the strings that make them up and the size of fuzzballs is the same as the observed size of black holes.

Refrences

"Fuzzballs." Wikipedia. 15 Aug. 2007 <http://en.wikipedia.org/wiki/Fuzzballs>.